Manufacture of pneumatic-tire casings



Aug. 6, 1929. P. w. LEHMAN MANUFACTURE OF PNEUMATIC TIRE CASINGS Filed Dec. 9, 1926 2 Sheets-Sheet Aug. 6, 1929. P. w. LEHMAN MANUFACTURE OF PNEUMATIC TIRE CASINGS z Sheets- Shee Filed Dec. 1926 IIII-IIIIM Paul w amm;

Patented Arugw ti, 1929.

UNITED STATES PATENT OFFICE.

PAUL W. LEHMJFKN, OF :MILVLTAUKEE, WISCONSIN, ASSIG'NOR TO THE FISK RUBBER COMPAN"Y, OF CHJiICOlE-E FALLS, MASSACHUSETTS, A COR-PGRATION OF IMAS$ACHU- MANUFACTURE OF IN'E'UliIATlC-TIRE GAEIFINGS.

Application filed December 9, 1526' hliy invention relates to the iiiairn'taflnire of pneumatic tire rzsings and more partieuiarl v t a device tor applying the so-oailed sidewall and ehalin strips as :l unit to the tire carcass while the latter is supji iorted upon the huildinn' eore. It is among; the objects oil? my invention to provid: a device for this purpose, which will accurately guide the unit strip into position on the casing and apply a llllittil'lil tension to the strip in sueh manner that the proper amount of SlthWVttll l'liliiJOl' and eha'linn strip will he plaeed on the casing. :i tin-thee ohjeot is to provide a device such ti at the unit sidewall and ehalinpg strip may he applied to eael side e'l' the iasing simuliltiittitifsijy'l Other and 'i'iurther ohjeets will. he ap iarent troin the ilollowinn' speeilieation and rhinis.

in the accompanying drawin; ;s which iiinstrate one embodiment of my invention,

Figure it is an end view oi? the de'vie shown in operative relation with the (bore,

i iguri L is plan view ot the nieehaniz-an shown in lligure l the huiiding eoro and )2t.3 inn hein r shown in eross-seetion l igure 3 is a trout side view ot the device showing the eenihinatioi s iidewail and, chating strip in seetion and in oi ierative position with res eet to the gi'lidingr and tensioninp; incnihers,

i inure 4- is a seetion suhstantially on line -l;--l. ot lfiignre 2 and li i sfl il't 5 is a letaiied persiieetii 'e View of the tei sion applying shoe.

lteterring to the drawings 1 desi iniates the huildinp; eore of a tire hu'iiding' machine and diagrrnnniatieaily indiattes the tire carcass to which the sidewadl and chafing iii) strip is to he applied. The api ii vii'ig deviee t in); ini 'ention comprises a guiding]: and tensioning nieniher, nanerally ilulieated, at 3, and lvlieniher Z and roll 4!;

an applying roll 4:. are seeured together as later deserihed and are adapted to he iii-ought into opera tire ro- Serial No. 153,606.

iliti flllfn tiled Mareh 19, 192-41: Patent No. l titii iiio, .Aynril 2 .11, 1928.

The ineinher 5 comprises upper and lower plates designated ii, and (3 res'pectiveiy and spared from each other hy a log 13 termed at, one end, oli plate (3 and a. guide plate '14: adapted to he held in :uljustedv position by means oi hoit provided with a wing nut to and sliding in slots .17 and i8 torined respia-tiveiy in plates 12 and (3. The under side oi plate (3 is provided with a boss 7 adapted to receive a stuh shatt 8 seeurei l to an arm 5) seeured in turn to shaft 10 ot applyinp; roll i-. llate (j is held in adjusted position on shalt H in; means ot set serews 11. Plate iir! is {)ifUYhlOtl adjacent one end with longitudinal slots and 21 :ulapted to reeeive the upstanding sides 22 and 2?; oi a U shaped tension applying; shoe 2 1-. Sides 22 and 28 are provided. rezaieetiwily with reelane uiar notches E35 and 26 adapted to receive a cross-plate 27 apertured at 29 :tor the passage ot a stem 3t) seeured in an arched portion iii of plate 12 intermediate slots 20 and 21. Stem 30 is threaded at its upper end, to reeeive a, nut 33 hetween whieh and phde It is positioned a eonipression spring 2&5. As will he evident spring 35 tends to 'l'orce shoe it down 'ardl v against the hottoni plate (5 andsthe pressure ot shoe 2 may he adjusted hy ineans ot nut 33. Plate (3 is provided adjaeent lug; 1?) with a longitudinal slot Eli adapted to receive the stem 38 ot guide plate ll), stem 33 being; provided with a, wine; out it to hold plate all) in adjusted position with respeet to plate (3. ir'hile the unit sideneil]. and (dialing strip varies in ditterent types o'li' tire ii'onstruetion it usually ineludes a strip oil. side ail ruhher and a eluding strip 5i, overla i 'iinn one edge 0 t the sidewall. ruhhen it being also euston'iar v to apply a strip o'l gumv 52 over the edge oi the ehating strip all) where it (n 'erlaps the sidewait rnltiher. \Vhen a sidewall and ehafing strip oi? this type is used its position, with respect to the elements o'l" my deviee, is shown in Figure 3 where the guide plate e10 is shown engaging the ei lge oi the ruhher strip 50 and nnderiyiinr the eiialijnn strip 5i. Shoe 2*]; is so positioned as to act upon the overlapping: portion ot the sidewall ruhher and ehacl'tinn is p and to apply tension cent: all)? to the strip as a hole. This a n'iheat" ii! iii tension v l a the edges remain relatively free of tension is an essential element of my invention.

It will be understood that with a type of sidewall presenting a smooth under surface plate 40 will be omitted and guide 14 relied upon to position the strip. In operation, with the device in the position shown in Figures 1 and 2, the unit sidewall, fed from suitable reels or other source of supply, is passed through the device as shown in Figure 3 and over applying roll 4 as indicated by broken line 53 in Figure 1. As will be ob vious from Figure 2 the unit sidewall strip as it is applied to the tire must be transversely curved to correspond to the curvature of the tire carcass. The application of tension to the central portion only of the strip assists the smooth application of both sidewall rubber and chafing strip. Since the degree of tension imparted to the strip as it is applied to the core determines the amount of strip applied,the application of such pressure to the center of the strip (which when the strip is in position on the tire casing corresponds to the mean circumference of the strip) tunetions to assure the application of the amount of sidewall rubber and chafing strip that is most desirable. It is further evident that my device is substantially automatic in character the operator merely engaging the advance end of the strip between roll 4 and the carcass on the core, setting the core in rotation and then severing the strip when the starting point is reached. My device thus makes it possible to apply the unit sidewall to both sides of the casing simultaneously.

Having described one embodiment of my invention I claim:

1. A device of the character described comprising a roll adapted to apply a unit sidewall strip to a. tire carcass supported upon a rotat able building core, means associated with the roll for guiding the strip thereto, and means positionedto apply a predetermined tension to the central portion only of the strip as it is applied to the carcass.

2. A device of the character described comprising a roll adapted to apply a unit sidewall strip to a tire carcass supported upon a rotatable building core, an adjustable guide men ber associated with the roll to guide the strip thereto and means torn'ling part of said member adapted to apply a predetermined tension to the central portion only of the strip as it is applied to the carcass.

' 3. A device of the character described comprising a roll adapted to be positioned to apply a unit sidewall strip to a tire carcass supported upon a rotatable building core, an adjustable guide member associated with the roll to guide the strip thereto, said guide member comprising upper and lower plates between which the strip passes and a spring pressed shoe, carried by the upper plate, adapted to apply a predetermined tension to the central portion only of the strip as the latter is applied to the carcass.

4. A device of the character described comprising a roll adapted to be positioned to apply a unit sidewall strip to a tire carcass supported upon a rotatable building core, an adjustable guide member associated with the roll to guide. the strip thereto. said guide meniber comprising upper and lower plates between which the strip passes, an adjustable guide plate positioned between said upper and 'lower plates and adapted to engage an outer edge of the strip and a spring pressed shoe, carried by the upper plate, adapted to apply a predetermined tension o l the cenl ral port ion only of the strip as the latter is applied to the carcass.

5. A device of the character described comprising a roll adapted to be positioned to apply a unit sidewall. formed of overlapping rubber and fabric strips, to a tire carcass supported upon a rotatable building core. an adjustable guide member associated with said roll to guide the unit sidewall strip thereto. said guide member con'iprising upper and lower plates between which the sidewall passes, a guide plate adjustably carried by said lower plate adapted to engage the inner edge of therubber strip and to underlie the fabric strip and a spring pressed shoe. carried by said upper plate, adapted to apply a pre determined tension to the central port ion only of the unit sidewall as the latter is applied to the carcass.

6. A device of the character described com prising a roll adapted to be positioned to apply a unit sidewall. tormed of overlapping rubber and fabric strips, to a tire carcass supported upon a rotatable building cure. an adjustable guide member associated with said roll to guide the unit sidewall strip thereto. said guide member comprising upper and lower plates between which the sidewall asses an ad'ustable uide )late iositioned between said upper and lower plates and adapted to guide the outer edge of the rubber strip, a second guide plate adjustably carried by said lower plate and adapted to engage the inner edge of the rubber strip and to underlie the fabric strip, and a spring pressed shoe. carried by said upper plate, adapted to apply a predetermined tension to the central portion only of the unit sidewall as the latter is applied to the carcass.

In testimony whereof. I have signed my name to the above specification.

PAUL \V. LEH MA N.

lltl 

